You cant buy an off peak ticket at 0928 when your train is a valid train leaving at 0935 for example.
Took me 35 minutes to renew my season last week - .....
Sounds like they've been taking lessons from the Post Office - I just love the "out of the door" queue when it's co-inciding pension day and car tax renewal day.
You weren't the lady behind me last December at Chippenham when I bought return tickets for a party of 80 ... total print run 160 tickets ... were you?
I don't deal with the machines myself, but you can buy all types of Same day tickets as far as i'm aware, and then tickets for tomorrow from about 3pm onwards.
Groupsave?
The other ticket type which (as far as I am aware) you cannot buy at machines is tickets that start from other stations. For example, if I was going from Chippenham to London in the morning, but only returning as far as Didcot in the evening, I would want a Chippenham to Didcot single (do-able) and a Didcot to London return (not do-able from the machine at Chippenham, as far as I know).
Probably my odd travelling habits, but I'm forever doing slighhtly different out and back journeys with some fairly odd ticketing needs!